Day 0: Hello, World! Problem : Hello, World
My code :

function greeting(parameterVariable) {
    // This line prints 'Hello, World!' to the console:
    console.log('Hello, World!');

    // Write a line of code that prints parameterVariable to stdout using console.log:
    console.log(parameterVariable);
}

Day 0: Data Types Problem : Data Types
My code :

function performOperation(secondInteger, secondDecimal, secondString) {
    // Declare a variable named 'firstInteger' and initialize with integer value 4.
    const firstInteger = 4;
    
    // Declare a variable named 'firstDecimal' and initialize with floating-point value 4.0.
    const firstDecimal = 4.0;
    
    // Declare a variable named 'firstString' and initialize with the string "HackerRank".
    const firstString = 'HackerRank ';

    console.log(parseInt(firstInteger) + parseInt(secondInteger));
    // Write code that uses console.log to print the sum of the 'firstInteger' and 'secondInteger' (converted to a Number type) on a new line.
    
    console.log(parseFloat(firstDecimal) + parseFloat(secondDecimal));
    // Write code that uses console.log to print the sum of 'firstDecimal' and 'secondDecimal' (converted to a Number type) on a new line.
    
    console.log(firstString + secondString);
    // Write code that uses console.log to print the concatenation of 'firstString' and 'secondString' on a new line. The variable 'firstString' must be printed first.

Day 1: Arithmetic Operators Problem : Arithmetic Operators
My code :

function getArea(length, width) {
    let area;
    area = length * width;
    
    // Write your code here
    
    return area;
}

/**
*   Calculate the perimeter of a rectangle.
*	
*	length: The length of the rectangle.
*   width: The width of the rectangle.
*   
*	Return a number denoting the perimeter of a rectangle.
**/
function getPerimeter(length, width) {
    let perimeter;
    perimeter = 2 * (length + width);
    // Write your code here
    
    return perimeter;
}

Day 1: Functions Problem : Functions
My code :

/*
 * Create the function factorial here
 */
function factorial(n) {
    var result = 1;
    for (var i=1; i<(n+1); i++) {
        result *= i;
    }
    return result;
}

Day 1: Let and Const Problem : Let and Const
My code :

function main() {
    const PI = Math.PI;
    // Write your code here. Read input using 'readLine()' and print output using 'console.log()'.
    const r = readLine();

    console.log(PI * r * r);
    // Print the area of the circle:
    console.log(2 * r * PI);
    // Print the perimeter of the circle:

Day 2: Conditional Statements: If-Else Problem : Conditional Statements: If-Else
My code :

Day 2: Conditional Statements: Switch Problem : Conditional Statements: Switch
My code :

Day 2: LoopsProblem : Loops
My code :

Day 3: Arrays Problem : Arrays
My code :

Day 3: Try, Catch, and Finally Problem : Try, Catch, and Finally
My code :

Day 3: Throw Problem : Throw
My code :

Day 4: Create a Rectangle Object Problem : Create a Rectangle Object
My code :

Day 4: Count Objects Problem : Count Objects
My code :

Day 4: Classes Problem : Classes
My code :

Day 5: Inheritance Problem : Inheritance
My code :

Day 5: Template Literals Problem : Template Literals
My code :

Day 5: Arrow Functions Problem : Arrow Functions
My code :

Day 6: Bitwise Operators Problem : Bitwise Operators
My code :

Day 6: JavaScript Dates Problem : JavaScript Dates
My code :

Day 7: Regular Expressions I Problem : Regular Expressions I
My code :

Day 7: Regular Expressions II Problem : Regular Expressions II
My code :

Day 7: Regular Expressions III Problem : Regular Expressions III
My code :

Day 8: Create a Button Problem : Create a Button
My code :

Day 8: Buttons Container Problem : Buttons Container
My code :

Day 9: Binary Calculator Problem : Binary Calculator
My code :